Microsoft has released a very interesting Virtual PC on her downloads site. In these VPC sits everything what Microsoft has at this moment for BI, among Office Enterprise 2007, SharePoint Portal server 2007, SQL server 2005 SP2, ProClarity 6.3 and PerformancePoint server 2007! Naturally you can only use these VPC for demonstration and evaluation aims.
For more info see http://bloggingabout.net/blogs/mglaser/archive/2008/06/02/business-intelligence-vpc-release-6.aspx
Another blog helps up get Performance Point up to date with the latest patches: